Ok, i drove a customer`s 94 chevy 1500 at work the other day, and it led me to ask this question again. His truck did the same as my 94 suburban. Theres a fast clicking noise inside the cab. It increases with engine speed. I cant pinpoint the noise. It seems to be under the dash, but im not certain. It almost sounds like if you lightly touched your fingernail against a computer fan. Has anyone else had this problem? Can anyne tell me what it is?

It happens both sitting still and moving. The speedo is elecronic on this one. Does not sound like a blinker relay. One thing i did notice is the noise changes to like sort of a buzz for only a half second whenever throttle position changes. But then it goes right back to the same steady ticking. Its real fast too. Kinda like a baseball card in a bike spoke. But different pitch.

Does anyone know what this clicking noise is? My 93 4.3 is doing the same thing. Sounds like an old clock or ticking time bomb noise that gets faster as I accelerate. It`s constant and sounds like it`s coming from under the driver dash? You can`t hardly hear it with the door open, but very noticeable when the door is closed. The sound is less noticeable when driving over 45 mph and the radio hides the clicking. This noise started after having the head, intake and exhaust gaskets replaced. The oil pressure unit was broken off back by the dizzy, but I replaced that?? Please please please someone help!! Thanks